Titre de chapitre moderne

Question

Je voudrais reproduire cette conception d'en-tête de chapitre que vous voyez dans l'image ci-dessous. Je suppose que titleec est la voie à suivre, mais j'ai du mal à aligner le nom du chapitre et le numéro du chapitre. De plus, comment gérez-vous les titres de chapitres très longs, afin qu'ils n'entrent pas en conflit avec le nombre?

Answer 1

Voici un exemple de la façon dont cela peut être fait:

\documentclass[12pt, a4paper,oneside]{book}
\usepackage{geometry}
\usepackage{newtxtext} 
\usepackage[svgnames]{xcolor}
\usepackage{graphicx} 
\usepackage[newlinetospace]{titlesec}

\titlespacing*{\chapter}{0pt}{*-4}{*8}
\titleformat{\chapter}[block]{\sffamily\bfseries\Huge\rlap{\hspace*{\textwidth} \scalebox{0.06}{\includegraphics{twd}}\vspace{-2ex}} \color{CornflowerBlue}\rlap{\rule{\paperwidth}{3pt}}}%
{\rlap{\makebox[\dimexpr\textwidth+\marginparsep+0.6 \marginparwidth][r]{\raisebox{-0.6\height}{\scalebox{2}{\thechapter}}}}}%
{0pt}{}%

  \begin{document}

  \setcounter{chapter}{3}
  \chapter{Tweedledum\\[-1ex] and Tweedledee}

They were standing under a tree, each with an arm round the other’s neck, and Alice knew which was which in a moment, because one of them had ‘DUM’ embroidered on his collar, and the other ‘DEE.’ ‘I suppose they’ve each got “TWEEDLE” round at the back of the collar,’ she said to herself.

 They stood so still that she quite forgot they were alive, and she was just looking round to see if the word “TWEEDLE” was written at the back of each collar, when she was startled by a voice coming from the one marked ‘DUM.’

 ‘If you think we’re wax-works,’ he said, ‘you ought to pay, you know. Wax-works weren’t made to be looked at for nothing, nohow!’

 ‘Contrariwise,’ added the one marked ‘DEE,’ ‘if you think we’re alive, you ought to speak.’

  \end{document}